Expire snapshots on a per table level

[gahtan-syarif]

Ideally snapshots can be expired on a per table level. This way, snapshots from large tables where historical tracking of changes is not that relevant (such as a facts table in Kimball data modelling) can be expired on a more frequent basis while snapshots from smaller tables where tracking historical changes can be important (such as a dimension table) can be expired on a much less frequent interval.